A vehicle determines whether or not a passage permit condition of the vehicle according to an instruction content of a traffic light in front of the vehicle is satisfied. If it is determined that the passage permit condition is not satisfied, the vehicle temporally stops in front of the traffic light and transmits an assist requiring signal to a remote facility. A display device of the remote facility displays reference image information indicating shot image information of the vehicle that temporally stops in front of the traffic light. An operator of the remote facility inputs positional information of pixels that make up the traffic light contained in the reference image information. The remote facility transmits assist information including the positional information to the vehicle. Based on the positional information, the vehicle determines again whether or not the passage permit condition is satisfied.